Một cổng chào có dạng hình parabol với chiều cao 1...
Câu hỏi: Một cổng chào có dạng hình parabol với chiều cao 18 (m), bề rộng chân đế 12 (m). Người ta căng hai sợi dây trang trí AB và CD nằm song song với mặt đất, đồng thời chia hình giới hạn bởi parabol và mặt đất thành ba phần có diện tích bằng nhau (như hình vẽ). Tính tỉ số \(\frac{{AB}}{{CD}}\).![](data:image/png;base64,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)
A. \(\frac{4}{5}\)
B. \(\frac{1}{{\sqrt 2 }}\)
C. \(\frac{1}{{\sqrt[3]{2}}}\)
D. \(\frac{3}{{1 + 2\sqrt 2 }}\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Trường THPT Tôn Đức Thắng